- For the glaze, melt together butter, sugar and maple syrup ina small saucepan set over medium heat, stirring occasionally.  
- Once the sugar has melted, add the bourbon, BBQ sauce, apple cider vinegar and hot sauce. Bring to a simmer, then reduce heat to medium-low and leave to simmer until glaze has thickened and bubbles look syrupy. Remove from heat and set aside until needed. (Glaze can be made while chicken is roasting) 
- For the stuffing, toss together breadcrumbs, lemon zest and juice, salt, pepper, and sage in a large bowl. Set aside. 
- Melt the butter in a medium sized saucepan set over medium-low heat. Add the onion and sauté gently until onions are soft and translucent. 
- Add the diced apple and cook for further 1 minute.  
- Pour saucepan contents over the breadcrumb mixture and toss very well.  
- Spoon stuffing into a baking dish, set aside. (Stuffing can be made while the chicken is cooking.) 
- For the chicken, preheat oven to 200°C / 180°C fan assisted.  
- Place spatchcock chicken in a large roasting tin. Drizzle over olive oil then season well with salt and pepper.  
- Roast chicken for 40 minutes, then remove from the oven and brush half of the glaze over the chicken. Return chicken to the oven along with the stuffing. 
- Roast for further 20 minutes, brushing the chicken with the remaining glaze. Finish roasting for a final 10 minutes. 
- Remove from the oven, cover the chicken loosely with tinfoil and leave to rest for about 10 minutes before serving with sage and apple stuffing.